There have various models with different knurling and colors, and different hole sizes for fitting different shaft.
CHOOSE YOUR STYLE
Set screw type
Full metal material, with grub screw on side of the knob,round shaft hole with different diameter, fit for spline and D shaft, tight screw to install on the shaft.
PUSH FIT TYPE
Metal knob with teeth and D plastic core to fit spline and D shaft,the main material is metal.
PUSH FIT TYPE
Aluminum shell with plastic insert, different plastic insert fit for spline and D shaft, the main material is plastic.